1999 Mitsubishi Triton indication lamp

Hi I have a 3ltr v6 4x4 and I recently did approx 100km on wet very muddy gravel road then drove 2000km home over several days of course, switching the car on and off then the next day I went to start the car it was hard to start (on petrol and lpg) after starting the car the check engine indication lamp amber light came on. Do you think that it's possible that the mud may have caused any sensor problems. A response with your thoughts would be much appreciated. Regards and many thanks Tony